12/5/2015 11:55 PM A 0/100 Gradebook Calculator Periodic Table Question 22 of 30

Question

12/5/2015 11:55 PM A 0/100 Gradebook Calculator Periodic Table Question 22 of 30 Map saplngleaning In clinical applications, the unit ppm (parts per million) is used to express very small concentrations of solute, where 1 ppm is equivalent to 1 mg of solute per 1 L of solution. Calculate the concentration in ppm for each of the following solutions. a) There are 35 calcium in a total volume of 69 mL. Number ppm b) There is 0.93 mg caffeine in a total volume of 127 mL Number ppm c) There is 0.67 mg trace particle in a total volume of 97 dL solution Number ppm Previous Give Up &View; Solution OCheck Answer Next Exit Hint

Explanation / Answer

For question a

1 ppm = 1µg/ml

35µg in 69ml

Therefore 1ml contains

= 35/69

= 0.51 µg/ml

= 0.51 ppm

For question b

mg to µg

0.93 mg = 930 µg

1ml contains

= 930/127

= 7.32 µg/ml

= 7.32 ppm

For question c

dl to ml

= 97 dl = 9700 ml

mg to µg

= 0.67 mg = 670 µg

1ml contains

= 670/9700

= 0.07 µg/ml

= 0.07 ppm

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